How to Unlock a File in Excel 2007

1. Open the Excel file.
2. Click the 'Review' tab on the command ribbon.
3. Click the 'Unprotect Sheet,' 'Unprotect Workbook' or 'Unprotect Shared Workbook' button in the 'Changes' group.
4. Type the password if a dialog box opens. Click 'OK.'
5. Edit the unprotected file.
6. Press 'Ctrl S' to save this file.